Toatl calories is 49.
She ate 1 during the day, so subtract 1 from the total to find how many calories she needs from her snacks :
49 -1 = 48 calories.
Each snack is 24 calories, so divide the number of calories she needs by 24 to find the number of snacks:
48 calories / 24 calories per snack = 2 snacks.
She needs to eat 2 late night snacks.